VALVE ISOLATION SYSTEM AND METHOD
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United States of America Patent
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Issued Date -
Nov 17, 2011
app pub date -
May 11, 2011
filing date -
May 12, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
One or more valves associated with a controlled machine process may be isolated from one or more remote isolation stations. For isolation, a manual switch is activated that are coupled to a safety relay. This relay is, in turn, coupled to a coil that removes power used to control the valve to be isolated. An operator-perceptible indication may be provided by monitoring a parameter representative of the valve state, such as pressure downstream of the valve. Such indication may be provided at each remote isolation station. The arrangement allows for lock-out of valves by remote operation.
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